Ground-based measurements of leaf area index: a review of methods, instruments and current controversies

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ID: 294468
2003
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Abstract
Leaf area index (LAI) is the total one-sided area of leaf tissue per unit ground surface area. It is a key parameter in ecophysiology, especially for scaling up the gas exchange from leaf to canopy level. It characterizes the canopy-atmosphere interface, where most of the energy fluxes exchange. It is also one of the most difficult to quantify properly, owing to large spatial and temporal variability. Many methods have been developed to quantify LAI from the ground and some of them are also suitable for describing other structural parameters of the canopy. This paper reviews the direct and indirect methods, the required instruments, their advantages, disadvantages and accuracy of the results. Analysis of the literature shows that most cross-validations between direct and indirect methods have pointed to a significant underestimation of LAI with the latter techniques, especially in forest stands. The two main causes for the discrepancy, clumping and contribution of stem and branches, are discussed and some recent theoretical or technical solutions are presented as potential improvements to reduce bias or discrepancies. The accuracy, sampling strategy and spatial validity of the LAI measurements have to be assessed for quality assurance of both the measurement and the modelling purposes of all the LAI-dependent ecophysiological and biophysical processes of canopies.
Reference Key
openalex_W2116635928 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors N.J.J. Bréda
Journal Journal of experimental botany
Year 2003
DOI
10.1093/jxb/erg263
URL
https://doi.org/10.1093/jxb/erg263
Keywords Keywords not found

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